Mold for casting pipes and cylinders



(No Model.)

J. GRAHAM, J1". & E. GRAVES.

MOLD FOB. 4CASTING PIPES AND GYLINDERS. No. 439.501.

Patented Oct. 28, 1890.

NTTED STATES PATENT OEEICE.

JOHN GRAHAM, JR., AND ERVIN GRAVES, OF CAMDEN, NEV JERSEY.-

MOLD FOR CASTING PIPES AND CYLINDERS.

SPEC. 'ICATION forming part of Letters Patent No. 439,501, dated October 28, 1890.

Application filed November 26, 1889.- Serial No. 331,615. (No model.)

To all whom t may concern.-

Be it known that we, JOHN GRAHAM, J'r., and ERWIN GEAvEs, both citizens of the United Stato?, and both residing in the city of Camden, and State of New Jersey, have jointly invented certain new and useful Improvements in Molds for Casting lipes and Cylinders, of which the following is a speeilication.

The object of ourinvention is the construction of a mold adapted for the casting of iron pipes and cylinders, which shall be formed of fewer parts and be therefore more simple, and which shall also beformed of practically incombustible material and be therefore more durable, than have been molds for the same purpose heretofore employed.

Further objects of the invention are the production, by the employment of a mold embodying our improvements, of pipes and cylinders which are internally of great uniformity and smoothness of finish; and the economizing of both the time and the cost of the manufacture of such pipes and cylinders, by dispensing with the wrappings of rope heretofore employed to wrap the core.

To these ends our invention comprehends an apparatus a good form of a convenient embodiment of which is represented in the accompanying drawings and hereinafter described, the particular subject-matter claimed as novel being hereinafter definitely specified.

In the drawings, Figure l is a central, vertical, sectifnal, elevation, through a mold embodying our improvements, taken in the plane of the dotted line 00em upon Fig. 3,-a portion of our improved core of the mold being shown in elevation, and a portion of the earthy covering of said core being broken away to exhibit the construction of its body. In this 'view the wedge bar which. serves to expand the collapsible core is represented in dotted lines ac in place to maintain the core expanded. Fig. 2 is a front elevational. view of the wedge bar removed from the core. Eig. 3 is a sectional plan of the apparatus shown in Fig. l, in the plane of the dotted line 'g-y upon said ligure. Fig. 4 is an under plan view of the mold represented in Fig. l, the view being especially illustrative of the segmental slots c in which play the Shanks of the retaining bolts c of the two lateral staybars OX.

Similar letters of reference indicate corresponding parts.

Our improved mold is of the following construction A is the seat or base of the core of the mold, made in the form of a solid and preferably open-centered circular disk having a iiaring or conical peripheral rim a, and upon its top face in adjacency to the upper edge of the said rim formed with an annular channel ax to contain sand to keep the molten metal of the end tace of the bell mouth of the pipe or end flange or end of the cylinder to be cast,- which face flange or end in the mold comes above said ehannel,-out of contact with the metal of the seat.

The core or core barrel of the mold erected upon and connected with the foregoing seat, and is composed of an interior annular collapsible shell B of sheet metal externally incased or enveloped with brick l) to form the body of the core. The bricks, as shown in the drawings, are connected with the shell by bolts hX but may be connected by other devices.

For the casting of bell mouthed pipes, the brick body is at the base of the core as a whole diametrically enlarged to form the external circumferential shoulder h2 which gives the internal form to the bell mouth of the pipe to be cast.

The brick body of the core is externally coated with a covering b3, preferably formed of gravel and clay, butwhich may be formed of any other preferred material.

The outer surfaces of this covering give the forni to the internal surfaces of the walls and bell mouth of the pipe to be cast. The connection between the shell of the core and the seat 0f the mold as an entirety may be con` veniently effected by the application of, for instance, three vertically erected bracket or stay bars, of which the central bar C is rigidly bolted to the seat A, and of which the two lateral stay bars CX C are adjustably connected therewith by bolts c, the shanks of which pass through segmental slots cx, which are slightly eccentric to the axis of the shell, formed in the seat, so thatboth wings or sides, so to speak, of the shell are adapted to have slight movement toward or from each other. This movement which is that which makes -that when the wedge bar is driven in the core is expanded, and that when it is driven out the core is collapsed. YOf course the expansion is to be effected before done and the collapsing after the metal of the cast pipe has set. The collapsibility of the core of a pipe mold is not novel with us.

D is the flask, formed, essentially, of an annular shell of metal to which the letter D is applied, suitably perforated and preferably composed in the direction of its length or height of sections flanged and clamped or bolted together, as shown. The lining of the shell of the flask is preferably and internally molded to the form of the exterior of the walls and bell mouth of the pipe, or of the walls and fiange of the cylinder, to be cast; and the lining, diametrically considered, is sufficiently larger than the core to afford a suitable annular interspace designated by the black surfaces E between it and the covering of the core.

In order to fit it to cast both cylinders and bell mouthed pipes, the lower portion of the shell of the flask of our mold is outwardly flared as at d', and provided with what we term a seat ring Ff-the connection being conveniently effected by forming a basal liange cl2 upon the shell to receive, for instance, screws threading into the seat-ring,- the same being an annular metal plate internally flared in an opposite direction to the Hare of the rim a of the seat, and of such diametric opening as to be adapted t-o seat itself upon said rim of said seat and thereby center itself and, in consequence, center the flask with respectto the seat'and the core upon said seat. This centering, as is obvious, is automatic, the corresponding flares of the seat and seat ring enabling us to dispose the iiask in axial concentricity with the mold without such centering as is involved, for instance, in the application of the open end of a cylinder, being a ilask, with respect to a circular rib diametrically corresponding therewith and applied to the seat or base of the mold as an entirety5-and the mere lowering of the flask with respect to the seat of the core, or the raising of the core and seat withY respect to the ask, being sufficient to secure automatically7 and without any radial adjustment the most exact concentric adjustment. It is obvious that the seat ring is essentially a portion of the flask, and that its formation as a separate melnber connected with the flask through the intervention of a basal the cast-ing is.Y

flange upon the liask is one of mere convenience of construction.

Of course in the relationship of parts just described, the annular interspace E may be filled with molten metal .to form the pipe to be cast. Vhen the pipe has been cast, the core is collapsed, and the flask, its connected seat ring and the pipe together lifted from off the core, or the core and its seat dropped downward and from out the flask and pipe.

Such being a preferred construction of a mold embodying our improvements, it is obvious that it possesses advantages over the older and well known forms of mold in use. Thus, for instance, the core being indestructible and formed Vof brick, and possessing, as formed, a uniform cylindric exterior surface, it is possible simply to apply to it the exterior coating and to entirely dispense with the application of the wrappings of hay rope heretofore resorted to for the wrapping of cores composed of or faced with metal. Thus, again, the socket heretofore employed and incased with a Wrapping of hay or straw rope is dispensed with,with the result that the resulting tube is cast with an expenditure of less time and at less cost and when cast possesses, as stated, a smoother interior than is found in pipes cast in the older forms of mold referred to.

Having thus described our invention, Wc claim and desire to secure by Letters Patent:-

l. A mold for casting pipes and cylinders, consisting, essentially, of a core composed of a brick facing upon a metal backing or shell, to which is connected a seat which forms the bottom of the mold cavity,-in combination with a flask composed of a lined shell of metal and provided with a basal seat ring conformed to encircle the rim of the seat of the core, substantially as set forth.

2. A mold for casting pipes and cylinders,

consisting, essentially, of a core composed of' a brick facing upon a metal backing or shell, to which core is connected a seat extended to form the bottom of the mold cavity and hav ing a flaring rim,-in combination with a flask composed of a Vlined shell of metal, and provided with a basal seat ring oppositely flared to conform to encircle the rim of the seat of the core, and adapted to automatically center itself with respect thereto, substantially as set forth.

3. A mold for casting pipes and cylinders, consisting, essentially, of a core composed of a brick facing upon a metal backing or shell formed with a basal shoulder to give the form to the interior of the bell mouth of the pipe, to which core is connected a seat which forms the bottom of the mold cavity,in combination with a flask composed of a lined shell of metal and provided with a basal seat ring conformed to encircle the rim of the seat of the core, substantially as set forth.

4. A mold for casting pipes and cylinders, consisting, essentially, of a core composed of IOO IIO

a shell of metal externally faced with brick, and covered with a coating of earthy matter, to which core is connected a basal seat which is extended to form the bottom of the mold cavity,-in combination with a flask composed of an external shell of metal lined with molding sand, and provided with an annular basal seat ring conformed to the rim of the seat of the core, substantially as set forth.

5. A mold for casting pipes and cylinders, consisting, essentially, of a core composed of a shell of metal externally faced with brick, and covered with a coating` of earthy matter, to which core is connected a basal seat which is extended to form the bottom of the mold cavity and is formed with a flaring rim,-in combination Wit-h a flask composed of an external shell of metal lined with molding sand, provided with an annular basal seat ring internally ila-red to conform it to the flared rim of the seat of the core, and adapted to automatically center itself and the flask which it carries with respect to said seat and core, substantially as set forth.

6. A mold for casting pipes, consisting, essentially, of a core composed of a shell of iron externally faced with brick, covered with a coating of earthy material, and formed With an external basal shoulder immediately above the seat to give the form to the interior of the bell mouth of the pipe, to which core is connected a basal seat Which is extended to form the bottom of the mold cavity,-in combination With a flask composed of an external shell of metal lined with molding sand, and provided with an annular basal seat ring inrernally conformed to the rim of the seat of the core, substantially as set forth.

7. A mold for casting pipes, consisting, essentially, of a core composed of a shell of iron externally faced With brick, covered with a coating of earthy material, and formed With an external basal shoulderimmediately above the seat to give the form to the interior of the bell mouth of the pipe, to which core is connected a basal seat which is extended to form the bottom of the mold cavity, said seat having a flaring rim ,-in combination with aflask composed of an external shell of metal lined with molding sand, provided with an annular basal seat ring internally oppositely flared to conform it to the flared rim of the seat of the core, and adapted to automatically center itself and the flask which it carries with respect to said core and seat, substantially as Set forth.

S. A mold for casting pipes, consisting', essentially, of a core composed of a collapsible metal shell faced with brick and connected free for a limited movement of collapse and expansion with a basal seat, which seat is extended to form the bottom of the mold cavity,-in combination with a flask composed of a lined shell of metal having an annular basal seat ring conformed to the rim of the seat of the core, essentially as set forth.

9. A mold for casting pipes, consisting, essentially, of a core composed of a collapsible metal shell faced with brick and connected free for alimited movement of collapse and expansion with a basal seat extended to form the bottom of the mold cavity and having a ilarin g rim ,-in combination with a flask composed of a lined shell of metal having an annular basal seat ring oppositely flared to conform it to the rim of the seat, and adapted to automatically center itself and the flask which it carries with respect to said seat and its core.

In testimony that we claim the foregoing as our invention We have hereunto signed our names this 13th day of November, A. D. 1889.

JOHN GRAHAM, JR. ERWIN GRAVES. In presence of WILLIAM J. HAMLIN, DANIEL HALLAM.

Pei

lt is hereby certified that in Letters Patent No. 430,501, granted October 2S, 1890, upon the application of John Graham, jr., and Erwin Graves, of Camden, New Jersey, for an improvement in Molds for Casting Pipes and Cylinders, en error appears in the printed speoifieetion requiring correction, as follows: In line 25, page 2, the Word and should reed smul d; and that the Letters Patent should be read with this correction therein that the sanne may conform to the record of the ease in the Patent Cfliee.

Signed, eonntersigned, and sealed this 18th day of November, A. D. 1890.

CYRUS BUSSEY, Assistant Secretary of the Interior.

[SEAL] Counter igned:

C. E. MITCHELL,

Commissioner of Patents. 

